I have one question, I've seen these with single speed and multiple speed on the rear wheel.
What is better and why?
>>1237785I would consider being "too old" if you are just
starting with dirt/street jumping at 40, and even then you can do stuff on the bike if you really want it, as long as you are on decent shape and you are not a fat fuck.
The age thing pretty much depends on how much do you care about how people see you.